Tlily - 150Pcs Drillforce Tools M35 Cobalt Drill Bit Set,Hss-Co Drill Set 1-3mm,for Drilling on Hardened Steel, Cast Iron

Color: gold Material: Cobalt steel alloy Cobalt drill bits are not made of pure cobalt, but rather a steel alloy with certain percent cobalt. The 5-percent alloy is known as M35 grade. The cobalt increases the strength of the steel and makes it more heat-. For Drilling Stainless Steel This set of M35 cobalt steel drill bits are particularly successful in cutting through hard metals such as stainless steel and cast iron, although they can be used for softer materials, too. 135 Degree Split Point The flater the drill, the smaller the chip width. This means less force required to remove metal, compared with lower angles like 90° and 118°. This is important on hard stuff, because your power requirements are already more than mild steel, so making the chip load less helps. It also reduces heat since less area is generating the cut. Not Suggested for Hardened Steel, High Carbon Steel and Steels Blended with Impurities Cooling Liquid Required Please use with cooling liquid to prolong the